Suppose we have a random sample of size n from a population represented by P( - ), i.e., ir'd Y1,...,Yn "" P( ' ). In particular, the (population) mean and variance are E[ Yi] = p and V(Y,) = 0'2, respectively, for all observations i = 1, ..., n. We would estimate the population mean u by the sample average: _ 1 " Y . = FiFIYi Choose the correct statement about if: Hint: See Lecture Note 1 (page 22 to 27). \"ant'1: 0 Ab'y'] = 02 \"arm A d' ? is always unbiased